Feature/replace caching

[creisle]

This replaces the custom caching with a standard caching library. It is very useful if you want to cache between scripts to (for example) an sqlite database so if you were generating many reports right after one another you could so so without having to make as many API calls. By default this will just use an in-memory cache (similar to the current behaviour) unless a cache_name is given.

However I am not sure if the one function i deleted is in use anywhere so that should be double checked with other stakeholders.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 85.71429% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.54%. Comparing base (b728677) to head (135df03).

Files with missing lines	Patch %	Lines
pori_python/graphkb/util.py	85.00%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #102      +/-   ##
===========================================
- Coverage    83.09%   82.54%   -0.55%     
===========================================
  Files           18       18              
  Lines         2466     2452      -14     
===========================================
- Hits          2049     2024      -25     
- Misses         417      428      +11     

Flag	Coverage Δ
unittests	82.54% <85.71%> (-0.55%)	⬇️

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